/// <summary> /// 查询单个值的方法 /// </summary> /// <param name="sql"></param> /// <returns>单个值</returns> public static object RunSQLReturnVal(string sql) { if ("odbc".Equals(dbType)) { return(DBAccessOfOdbc.RunSQLReturnVal(sql)); } else if ("oledb".Equals(dbType)) { return(DBAccessOfOleDb.RunSQLReturnVal(sql)); } else if ("oracle9i".Equals(dbType)) { return(DBAccessOfOracle9i.RunSQLReturnVal(sql)); } else if ("sql".Equals(dbType)) { return(DBAccessOfSql.RunSQLReturnVal(sql)); } else if ("sqlite".Equals(dbType)) { return(DBAccessOfSQLite.RunSQLReturnVal(sql)); } else { return(null); } }